Mike Goldman's official website has been updated to list "2012 Big Brother" in his credits. This confirms the series' former voice artist, warmup guy and host to be returning for the new season. In what capacity he will be involved is still unknown.
Mike narrated Daily Shows for all eight previous seasons, was the crowd warmup guy for most of the series' live audience shows, hosted Big Brother UpLate from 2003-2007, co-hosted Friday Night Live with Ryan and Bree from 2005-2008, and even co-hosted a Live Eviction show with Jackie O in 2008 when Kyle Sandilands was unwell.
Mike was always more in touch with the show and the fans than Gretel, and his return in any capacity will be welcome.